Yukio Yokoyama /
Chopin /
Etude No. 21 in G-Flat Major, Op. 25, No. 9 'Butterfly'
October 7 - 9, 1992 in Tokyo - Bunka Kaikan - Mai Mai Hall
- ( 1 CD ) Sony SK 62605
- ( 1 CD ) Sony Japan SRCR-2685
- ( 1 SA ) Sony Classical Japan SICC 10021
March 9 - 10, 2011 in Ueno Gakuen - Ishibashi Memorial Hall
- (12 CD) King Records KICC-91440
- ( 1 CD ) King Records KICC-918
- ( 1 CD ) King Records KIGC8